I find error No Fill
You Need To Approve Your Application in FB Audience Network Before Showing Ads.
Bro Test Ads Not Working
I have 4 Years experience in App Inventor
Test Ads will only work if you using real placement ID
sdk problam. facebook update sdk 6.4 but NIOTRON not update.
Oh sir, you seem to be the smartest developer here. I also found a bug in builder,
It’s returnig 2+2 insted of 4, Really this builder have so many bugs. 
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Niotron not updated but still my ads showing with old sdk. And ecpm too good. Maybe issue with your block show blocks.